Beam and girder.



N W. P. ANDERSON.

' BEAM AND GIRDEB.

A PPPPPPPPPPPPPPP BEPT.28, 191:.

. 1,088,676; r Patented Mar. 3,191{L UNITED STATES PATENT ora ion- WILLIAM P. ANDERSON, 0F CINCINNATI. OHIO, ASSIGNOR TO THE FERRO CONCRETE OONSTRUCTiON COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

BEAM AND GIRDER.

Specification of Letters Patent.

Application filed September 28, 1911.

Patented Mar. 3, 1914s..

sci-an No. 651.711.

To all whom it may concern Be 1t known that I, \Vnaaan l. ANDER- son, a citizen of the United States of America, and resident of Cincinnati, countv of Hamilton, and State of Ollio havc invented certain new and useful iniprovcn'ients in Beams and Girders, of whichi the following is a specification. l a

Heretofore in some instances concrete beams and girders have been of a form which is rectangular in cross-section and the joint between the beams and girders was a right angle, and in other instances the beams and girders have'boen made of av tapering form, the narrower portion of the taper occurring at the bottoms of the beams and girders. In the first form, great diiticulty was CXpOllLIK'Gd in removing the forms from the mtnnbcrs, after the concrete had become set. The tapering form of beam and girder facilitates the removal of the form work, but it is found that a greater amount of concrete is used in forming these tapering members, and greater ditliculty is experienced in making the tapering form work. p

The object of my invention is a concrete beam and girder from which a form work may be readily detached, and in which said ease of detachment is secured without increasing the material in said members, or the labor of making the forms.

' Referring to the accompanying drawings, in which like parts are indicated by similar reference letters: Figure l is a perspective View of a beam, at girdci and the connecting joint embodying my inventitm. Fig. 2 is a perspective View of the parts of the beam and girder forms for molding a beam, girder and oint embodying my inventitm. Fig. 3 1s a perspective view of a portion of thc girder form, taken from the opposite side from the view shown in Fig. 2.- Fig. 4: is a perspective view of a portion of the beam form.

Referring to the parts: Girder A and beam B are made with vertical sides, and in the corners between the sides of the beam an'dthe adjacent side of the girder, corner blocks Dare formed. These corner blocks are made wedge-shaped, with the narrower part of the taper (n-cnrring near the bottom of the beam. The girder A, beam B and blocks D are formed at. one time, so that they are monolithic.

l have illustmtcd a Form work by which the beam and gl'i'der embodying my invention may be molded. in this form work, the sides a of the girder form have tapering openings (2, adjacent. to the edges of which and upon the exterior whereof, battens a are secured. The ends 7' of the beam :tiorms f are cut at an angle to the vertical equal to the taper in the corner block D, and upon the inclined ends. battens f f'" are formed, whereby the ends of the boards at the openings e and the ends f of the boards of the beam form, together with the battens c f o f, form a tapering mold for the corner blocks D. By this construction, the angle between the lower edge of a board and the concrete with which it. contacts, is made obtuse, so that in removing the forms, they may be readily lowered away from the concrete. The sides of the forms being vertical, renders their manufacture easier.

The points, at, which the tendency of the form work to bind is most apt to occur, are at the corners between the beams and girders. By having corner blocks with a marked inclination in the sides, 1 overcome this tendency. Oi course, it is recognized that a beam and a girder with slightly inclined sidcs'wonld not depart from the spirit and scope of my invention, providing corner blocks with comparatively decided tapers were used therewith.

iVhat I claim is:

A i'i'ionolithic structure comprising rectangular girders, rectangular beams joining the girders, and wedge-shaped blocks located at the juncture of the girders and beams, one face of a block tapering toward the vertical face of the beam and the other face of the block tapering toward the faceof the girder.

WILLIAM P. ANDERSON.

Witnesses WVALTER F.v MURRAY, W. THORNTON Boonn'r. 

